The Hydra has risen! It's heads just grow back so you can't defeat it, but maybe you can recapture it! Some runestones have appeared around the lake. You will need 9 Hydra Fangs to shatter the runes, and toss the remains in the bonfire we have set up to destroy them forever! I hope this works….

Hmmm. I guess those runestones were what was keeping the tower up. I guess dropping a stone tower on it works just as well as recapturing it. With the Lake Hydra out of the way the only thing left is Chaos Lord Escherion…